General Electric 12IAC77B32A is a single‑function IAC time‑overcurrent relay in GE’s IAC77 family, designed for 60 Hz protection schemes in electrical power systems. The unit combines a magnetic core operating coil, an induction disc, a damping magnet, and a mechanical target to provide time‑delayed tripping when current exceeds the set value. For this variant, the time‑overcurrent (TOC) input is specified at 1.5–6 A and the instantaneous overcurrent (IOC) range is 10–40 A, offered in Form 800 and up packaging suitable for integration into GE protection assemblies. Catalog entries from GE distributors confirm the 12IAC77B32A as a Time Overcurrent Relay in the IAC77B family.
